"Paramedics treated the patients and provided the seriously injured with advanced life support interventions before they were transported to a nearby hospital for further treatment," Meiring said.

Roads near the accident will reportedly be shut for hours because of aviation fuel on the road surface.

UPDATE: Roads near the military helicopter crash along the N1 Highway will be shut for a while, says a source on the scene, due to aviation fuel on the road surface. PIC: Benny Gool/Oryx Multimedia pic.twitter.com/CtGIJ6rcTw